# Is there any link between the weekly human cycle and weather?

I am interested in the linkage between the cyclical timing of human activity, and whether that has a direct effect on weather. Most obvious to me is the weekly cycle, which is observed by most of the world.

For example, humans generally produce less air emissions on the weekends because they do not have to commute to work, and some businesses are less active. This means there are less cars on the road (or for less time) and therefore less vehicular emissions. In some cities, this can lead to an effect during the summer where ozone concentrations are higher on weekdays and reduced on the weekends. There are also instances where human activity can lead to higher particulate emissions on weekdays, which could cause weekly patterns in fog or albedo. In general, if the radiation budget is perturbed, it could theoretically affect weather.

Perhaps there are other examples too. So, is there any link between the weekly human cycle and weather?

• This is a good question in general, but can you source humans are generally less active on the weekends. I'm not disagreeing with you, but people do travel on weekends and perform recreational activities, so I don't know if weekends = more activity, less activity, or same amount of activity (but different type of activity). Additionally, people who stay home may use more heat or AC since they're not at work all day. – user967 Nov 28 '19 at 14:50
• Here's a couple links that talk about the day of week emissions change. researchgate.net/publication/… and sciencedirect.com/science/article/pii/S1352231018307854 – farrenthorpe Nov 28 '19 at 18:32
• In general, the total emissions are less on the weekends for large cities, and the diurnal pattern is different. This is a core understanding in the field of air quality monitoring and modeling. So, in general, I am confident that the weekday/weekend air emissions cycle exists, but I have no idea if this affects weather beyond localized aerosols scattering light. – farrenthorpe Nov 28 '19 at 18:38
• It is difficult to reply. Considering CO2 as sample: The biggest actors on human air emissions are the petrol companies (35%) and the cement companies 8%. Those industries are working 24 hours a day and 365 days a year. That is 43% of the emissions and there are always there. Transportation is just 16% of the emissions, and some of it is the one that it is reducing... – David García Bodego Dec 2 '19 at 10:05
• Check out the Rosenfeld and Bell 2011 paper on aerosol feedback affecting cloud, hailstorm and tornadoes formation ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20110015368.pdf – Dmitri Chubarov Dec 13 '19 at 6:12